TELEPHONE : + 44 (0) 1684 891500 FACS IMILE: + 44 (0) 1684 891600 EMA IL: sa les@ e lectron icdev ice.demon.co.uk WEB S ITE: lectron icdev ice.demon.co.uk IMPORTANT 1. The equipment supplied must not be modified in any way since modifications will invalidate intrinsic safety certification, MCA and Lloyds approval. 2. Care should be taken during servicing as high voltages may be present on the output contacts. 3. It is important to note that the ED810 contains four Zener Barriers, type ZB1, which